KIP-479 — Add StreamJoined config object to Join

Accepted Kafka 2.4 Streams

Adds a StreamJoined config object to KStream join operations, allowing users to specify custom SerDes, custom state store suppliers, and named repartition topics for both sides of a stream-stream join. Previously there was no unified way to configure the two windowed state stores backing a stream join, and SerDes had to be inferred or set globally.

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